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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909a87054c40910278cdcdabdb52a5f87dd39e0e122912cc6ed00112351167f6' 
  AND token = '7FY8sxSBq/KSQ3PsepM++tAAuymmP3fPYICYcZemrEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}